When her mother was murdered, her dad (an Arcanine) abandoned her and her sister Leaf, threatening to reduce them to ashes, she lived in a small cave with her. She evolved into a Glaceon when she went to a snowy mountain without letting her sister know about it and finding a big icy rock. Lazuli used to be kind and gentle like her twin sister, but when their dad abandoned them, she became afraid of anyone around her. In fact, she started to not trust anyone and closed her heart.